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PostPosted: Fri Jun 23, 2017 10:13 am 
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Someone on another forum I frequent suggested I post my question here, so having just signed up I'm hoping those in the know can offer some thoughts.

We are due to have our loft conversion start in a few weeks and the first step is to replace our ageing boiler with a new combi so we can remove the tank in the loft. I had this done in my previous house and it was a simple enough job so I didn't think anything of it until the plumber came round to have a look prior to doing the install this coming Monday.

It appears that we only have a 15mm gas supply running through the house and my plumber/Google tell me this must be 22 or 28mm to run a combi. The house was built in 1996 which seems new to me, but I guess it's over 20 years old and things change...

The house is mid-terrace with the gas meter at the front and the boiler currently in the kitchen at the rear of the property and I'm currently looking for options. I think they are:

1. Further investigation reveals that the gas supply through the house is sufficient and it's only the last metre to the boiler than is 15mm pipe. How likely is this on a house built in 1996?

2. We run a new gas supply through the house to the kitchen and replace the boiler as planned.

3. We run a new gas supply to the loft and place the new combi in the en-suite (which will be at the front of the house, so potentially a simpler run of gas).

4. We install an unvented cylinder as a means to remove the cold water tank in the loft and use our current boiler. Not ideal as I don't think our current boiler will last too much longer and I'm not sure it is even suitable for this job.

5. We install an unvented cylinder and a new boiler. Do all new (non-combi) boilers require a 22/28mm gas supply?


Any thoughts on preferred solutions, things I need to be aware of and any other options I'm unaware of would be very much appreciated as this really isn't an area I'm familiar with.

Thanks in advance


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PostPosted: Fri Jun 23, 2017 4:51 pm 
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Any other gas appliances in your home?

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www.drlgas.co.uk


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PostPosted: Fri Jun 23, 2017 8:40 pm 
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gas4you wrote:
Any other gas appliances in your home?

Just a gas oven in the kitchen.


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PostPosted: Fri Jun 23, 2017 10:37 pm 
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Obviously I am not there to work it out properly, but as a general rule, gas meter at front of property with combi and gas oven at the back, I would be fitting 28mm up to where the oven tees off the pipe work.

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